Improvement in tool-holders for planers



J. S. ELTEN B0 B0 U G H Tool-Holders for nyz Witmm:

UNITED STATES PATEnrOFFrcn.

JAJIES S. ELTENBOROUGH, OF EASTON, PENNSYLVANIA.

H VIPROVEMENT IN TOOL-HOLDERS FOR PLANERS.

Specification forming part of Letters Patent No. 13 .1,] 9S, datedDecember 24, 1872.

To all whom it may concern.-

Be it known that I, JAMES S. ELTENBOR- QUGH, of Easton, in the county ofN orthampton and State of Pennsylvania, have invented a new and ImprovedSlotting Tool Holder, of which the following is a specification:

My invention consists of a relief bar or plate pivoted to the end of theshank by which the tool is attached to the reciprocating bar of themachine, at right angles to the line of motion with a tool-post similarto the toolpost of a turning-lathe, for holding the tool, the reliefbarbeing arranged to swing and free the point of the tool from the workwhen it moves back, to prevent it from rubbing on the work and beingworn thereby, and broken when escaping from the end of the work, thesaid bar being provided with a spring to throw it back into the workingposition before beginning to cut, and the tool-post being arranged toshift the tool sidewise for under cutting and other purposes.

Figure l is a sectional elevation of my improved slotting-tool holder.Fig. 2 is a front elevation.

Similar letters of reference indicate corresponding parts.

plate is pivoted at D, so as to swing slightly in the plane of thedirection in which the tool is moved, but it is prevented from movinglaterally. Between the pivot and the front end a spring is introducedbetween the bottom of the groove and the relief-plate to keep the rearend of the latter against the head of the shank. Between the pivot andthe rear end of the head the tool-post F, similar to those used in aturning-lathe, is mounted to hold the tool G, the shank of which isconfined against the face of the relief-plate by the bindin g-screw H.The post is capable of turning on its axis to swing the tool sidewise toadjust it to the work for under cutting, &c.

It will be seen that the spring will yield when the tool goes back, sothat the tool will be relieved from the pressure to which it is subjectwhen it is fastened rigidly in the ordinary way, which wears oft thepoint very fast and breaks it when it escapes over the edge of the workat the upper side.

Having thus described my invention, I claim astnew and desire to secureby Letters Paten A slotting-tool holder consisting of a shank, A, with agrooved head, B, a relief-plate, (J, pivoted to the slotted head, aspring, E, a tool-post, 1*, and a binding-screw, H, com bined andarranged substantially as specified.

JAMES S. ELTENBOROUGH.

Witnesses:

G. PARKS, T. P. HELLER.

